<template>
	<div class="upload-file">
		<el-upload
			ref="fileUploadRef"
			:action="uploadFileUrl"
			:before-upload="handleBeforeUpload"
			:file-list="fileList"
			:headers="headers"
			:limit="limit"
			:on-error="handleUploadError"
			:on-exceed="handleExceed"
			:on-success="handleUploadSuccess"
			:show-file-list="false"
			class="upload-file-uploader"
			multiple
		>
			<!-- 上传按钮 -->
			<el-button type="primary">选取文件</el-button>
		</el-upload>
		<!-- 上传提示 -->
		<div v-if="showTip" class="el-upload__tip">
			请上传
			<template v-if="fileSize">
				大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
			</template>
			<template v-if="fileType">
				格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
			</template>
			的文件
		</div>
		<!-- 文件列表 -->
		<transition-group class="upload-file-list el-upload-list el-upload-list--text" name="el-fade-in-linear"
						  tag="ul">
			<li v-for="(file, index) in fileList" :key="file.uid"
				class="el-upload-list__item ele-upload-list__item-content">
				<el-link :href="`${file.url}`" :underline="false" target="_blank">
					<span class="el-icon-document"> {{ getFileName(file.name) }} </span>
				</el-link>
				<div class="ele-upload-list__item-content-action">
					<el-link :underline="false" type="danger" @click="handleDelete(file)">删除</el-link>
				</div>
			</li>
		</transition-group>
	</div>
</template>

<script lang="ts" setup>
import { propTypes } from "@/utils/propTypes";
import { globalHeaders } from "@/utils/request";
import { removeFile } from "@/api/common";

const props = defineProps({
	modelValue: [String, Object, Array],
	// 数量限制
	limit: propTypes.number.def(5),
	// 大小限制(MB)
	fileSize: propTypes.number.def(5),
	// 文件类型, 例如['png', 'jpg', 'jpeg']
	fileType: propTypes.array.def(["doc", "docx", "xls", "xlsx", "ppt", "txt", "pdf"]),
	// 是否显示提示
	isShowTip: propTypes.bool.def(true),
});

const { proxy } = getCurrentInstance() as ComponentInternalInstance;
const emit = defineEmits(["update:modelValue"]);
const number = ref(0);
const uploadList = ref<any[]>([]);

const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadFileUrl = ref(baseUrl + "/common/upload"); // 上传的w文件务器地址
const headers = ref(globalHeaders());

const fileList = ref<any[]>([]);
const showTip = computed(
	() => props.isShowTip && (props.fileType || props.fileSize),
);

const fileUploadRef = ref<ElUploadInstance>();

watch(() => props.modelValue, async val => {
	if (val) {
		let temp = 1;
		// 首先将值转为数组
		let list: string[];
		if (Array.isArray(val)) {
			list = val as string[];
		} else if (typeof val === "string") {
			list = val.split(",");
		} else if (typeof val === "object" && val !== null) {
			list = Object.values(val).map(item => String(item));
		} else {
			list = [];
		}
		// 然后将数组转为对象数组
		fileList.value = list.map(item => {
			if (typeof item === "string") {
				if (item.indexOf(baseUrl) === -1) {
					// 如果该项不包含 baseUrl，则在其前面加上 baseUrl
					return { name: baseUrl + item, url: baseUrl + item };
				} else {
					// 否则直接使用该项作为 name 和 url
					return { name: item, url: item };
				}
			}
			item.uid = item.uid || new Date().getTime() + temp++;
			return item;
		});
	} else {
		fileList.value = [];
		return [];
	}
}, { deep: true, immediate: true });

// 上传前校检格式和大小
const handleBeforeUpload = (file: any) => {
	// 校检文件类型
	if (props.fileType.length) {
		const fileName = file.name.split(".");
		const fileExt = fileName[fileName.length - 1];
		const isTypeOk = props.fileType.indexOf(fileExt) >= 0;
		if (!isTypeOk) {
			proxy?.$modal.msgError(`文件格式不正确, 请上传${props.fileType.join("/")}格式文件!`);
			return false;
		}
	}
	// 校检文件大小
	if (props.fileSize) {
		const isLt = file.size / 1024 / 1024 < props.fileSize;
		if (!isLt) {
			proxy?.$modal.msgError(`上传文件大小不能超过 ${props.fileSize} MB!`);
			return false;
		}
	}
	proxy?.$modal.loading("正在上传文件，请稍候...");
	number.value++;
	return true;
};

// 文件个数超出
const handleExceed = () => {
	proxy?.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
};

// 上传失败
const handleUploadError = () => {
	proxy?.$modal.msgError("上传文件失败");
};

// 上传成功回调
const handleUploadSuccess = (res: any, file: UploadFile) => {
	if (res.code === 200) {
		uploadList.value.push({ name: res.data.fileName, url: res.data.url });
		uploadedSuccessfully();
	} else {
		number.value--;
		proxy?.$modal.closeLoading();
		proxy?.$modal.msgError(res.msg);
		fileUploadRef.value?.handleRemove(file);
		uploadedSuccessfully();
	}
};

// 删除文件
const handleDelete = (file: UploadFile) => {
	const findex = fileList.value.map(f => f.name).indexOf(file.name);
	let filePath = file.url;
	// 检查 file.url 是否包含 baseUrl
	if (filePath.includes(baseUrl)) {
		// 去掉 baseUrl
		filePath = filePath.replace(baseUrl, "");
	}
	let fileParam = {
		filePath: filePath,
	};
	removeFile(fileParam).then((res) => {
		if (res.code === 200) {
			proxy?.$modal.msgSuccess("删除成功");
		} else {
			proxy?.$modal.msgError(res.msg);
		}
	});
	if (findex > -1) {
		fileList.value.splice(findex, 1);
		emit("update:modelValue", listToString(fileList.value));
		return false;
	}
	return true;
};

// 上传结束处理
const uploadedSuccessfully = () => {
	if (number.value > 0 && uploadList.value.length === number.value) {
		fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value);
		uploadList.value = [];
		number.value = 0;
		emit("update:modelValue", listToString(fileList.value));
		proxy?.$modal.closeLoading();
	}
};

// 获取文件名称
const getFileName = (name: string) => {
	// 如果是url那么取最后的名字 如果不是直接返回
	if (name.lastIndexOf("/") > -1) {
		return name.slice(name.lastIndexOf("/") + 1);
	} else {
		return name;
	}
};

// 对象转成指定字符串分隔
const listToString = (list: any[], separator?: string) => {
	let strs = "";
	separator = separator || ",";
	for (let i in list) {
		strs += list[i].url.replace(baseUrl, "") + separator;
	}
	return strs != "" ? strs.substring(0, strs.length - 1) : "";
};
</script>

<style lang="scss" scoped>
.upload-file-uploader {
	margin-bottom: 5px;
}

.upload-file-list .el-upload-list__item {
	border: 1px solid #e4e7ed;
	line-height: 2;
	margin-bottom: 10px;
	position: relative;
}

.upload-file-list .ele-upload-list__item-content {
	display: flex;
	justify-content: space-between;
	align-items: center;
	color: inherit;
}

.ele-upload-list__item-content-action .el-link {
	margin-right: 10px;
}
</style>
